Initial commit.

3 files changed, 188 insertions, 0 deletions

diff --git a/libdimension/dimension/canvas.h b/libdimension/dimension/canvas.h
new file mode 100644
index 0000000..251c64a
--- /dev/null
+++ b/libdimension/dimension/canvas.h
@@ -0,0 +1,50 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * A canvas which is rendered to.
+ */
+
+#ifndef DIMENSION_CANVAS_H
+#define DIMENSION_CANVAS_H
+
+/* 48-bit sRGB color for pixels. */
+typedef struct {
+  uint16_t r, g, b;
+  uint16_t a, t;
+} dmnsn_pixel;
+
+dmnsn_pixel dmnsn_pixel_from_color(dmnsn_color color);
+dmnsn_color dmnsn_color_from_pixel(dmnsn_pixel pixel);
+
+typedef struct {
+  unsigned int x, y;
+
+  /*
+   * Stored in first-quadrant representation (origin is bottom-left).  The pixel
+   * at (a,b) is accessible as pixels[b*x + a].
+   */
+  dmnsn_pixel *pixels;
+} dmnsn_canvas;
+
+dmnsn_canvas *dmnsn_new_canvas(unsigned int x, unsigned int y);
+void dmnsn_delete_canvas(dmnsn_canvas *canvas);
+
+#endif /* DIMENSION_CANVAS_H */
diff --git a/libdimension/dimension/color.h b/libdimension/dimension/color.h
new file mode 100644
index 0000000..1f4a42e
--- /dev/null
+++ b/libdimension/dimension/color.h
@@ -0,0 +1,46 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * Types to represent color.
+ */
+
+#ifndef DIMENSION_COLOR_H
+#define DIMENSION_COLOR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* CIE 1931 XYZ color. */
+typedef struct {
+  double X, Y, Z; /* X, Y, and Z are the tristimulus values of a color in CIE
+                     1931 XYZ color space.  We use an unlimited light model
+                     here, where the range of X, Y, and Z are unbounded >= 0. */
+  double alpha, trans; /* Alpha transparancy only lets light of this color
+                          through; regular transparancy lets all colors
+                          through */
+} dmnsn_color;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DIMENSION_COLOR_H */
diff --git a/libdimension/dimension/geometry.h b/libdimension/dimension/geometry.h
new file mode 100644
index 0000000..2c0c204
--- /dev/null
+++ b/libdimension/dimension/geometry.h
@@ -0,0 +1,92 @@
+/*************************************************************************
+ * Copyright (C) 2008 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of Dimension.                                       *
+ *                                                                       *
+ * Dimension is free software; you can redistribute it and/or modify it  *
+ * under the terms of the GNU Lesser General Public License as published *
+ * by the Free Software Foundation; either version 3 of the License, or  *
+ * (at your option) any later version.                                   *
+ *                                                                       *
+ * Dimension is distributed in the hope that it will be useful, but      *
+ * WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+/*
+ * Core geometric types like scalars, vectors, and rays.
+ */
+
+#ifndef DIMENSION_GEOMETRY_H
+#define DIMENSION_GEOMETRY_H
+
+/* Scalar and vector types. */
+typedef double                           dmnsn_scalar;
+typedef struct { dmnsn_scalar x, y, z; } dmnsn_vector;
+
+/* Vector arithmetic */
+
+inline dmnsn_vector
+dmnsn_vector_construct(dmnsn_scalar x, dmnsn_scalar y, dmnsn_scalar z)
+{
+  dmnsn_vector v = { .x = x, .y = y, .z = z };
+  return v;
+}
+
+inline dmnsn_vector
+dmnsn_vector_add(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  return dmnsn_vector_construct(lhs.x + rhs.x, lhs.y + rhs.y, lhs.z + rhs.z);
+}
+
+inline dmnsn_vector
+dmnsn_vector_sub(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  return dmnsn_vector_construct(lhs.x - rhs.x, lhs.y - rhs.y, lhs.z - rhs.z);
+}
+
+inline dmnsn_vector
+dmnsn_vector_mul(dmnsn_scalar lhs, dmnsn_vector rhs)
+{
+  return dmnsn_vector_construct(lhs*rhs.x, lhs*rhs.y, lhs*rhs.z);
+}
+
+inline dmnsn_vector
+dmnsn_vector_div(dmnsn_vector lhs, dmnsn_scalar rhs)
+{
+  return dmnsn_vector_construct(lhs.x/rhs, lhs.y/rhs, lhs.z/rhs);
+}
+
+inline dmnsn_scalar
+dmnsn_vector_dot(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  return lhs.x*rhs.x + lhs.y*rhs.y + lhs.z*rhs.z;
+}
+
+inline dmnsn_vector
+dmnsn_vector_cross(dmnsn_vector lhs, dmnsn_vector rhs)
+{
+  return dmnsn_vector_construct(lhs.y*rhs.z - lhs.z*rhs.y,
+                                lhs.z*rhs.x - lhs.x*rhs.z,
+                                lhs.x*rhs.y - lhs.y*rhs.x);
+}
+
+/* A line, or ray. */
+typedef struct {
+  dmnsn_vector x0; /* A point on the line */
+  dmnsn_vector n;  /* A normal vector; the direction of the line */
+} dmnsn_line;
+
+/* A point on a line, defined by x0 + t*n */
+inline dmnsn_vector
+dmnsn_line_point(dmnsn_line l, dmnsn_scalar t)
+{
+  return dmnsn_vector_add(l.x0, dmnsn_vector_mul(t, l.n));
+}
+
+#endif /* DIMENSION_GEOMETRY_H */